An LLC and an S corporation are not two versions of the same thing, and treating them that way is where most small business owners go wrong. An LLC is a legal entity you form under state law. An S corporation is a federal tax election that an eligible corporation or LLC makes by filing a form with the IRS. So when people compare LLC vs S corporation, the real question is usually whether an LLC should keep its default tax treatment or elect to be taxed as an S corporation. The answer turns on how much the business earns, who owns it, how profits get split, and how much debt the business carries.
How Each Is Taxed by Default
A single-member LLC is a “disregarded entity” for federal tax purposes. The IRS ignores it and the owner reports all business income on their personal return. A multi-member LLC defaults to partnership taxation: the business files an informational return, and profits and losses pass through to each member.1Internal Revenue Service. Single Member Limited Liability Companies Neither pays federal income tax at the entity level.
An S corporation is also a pass-through. The entity owes no federal income tax, and income, losses, deductions, and credits flow to shareholders.2Internal Revenue Service. S Corporations The difference is that S corporation status requires an affirmative election on Form 2553. An LLC that elects S corporation taxation is still an LLC under state law; only the tax rules change.
So the comparison you actually face isn’t LLC or S corporation as separate categories. It’s whether your LLC stays taxed as a partnership or disregarded entity, or whether it elects S corporation taxation. That single choice reshapes your payroll taxes, your ability to deduct losses, and how you can split profits.
The Payroll Tax Difference
This is the reason profitable small businesses elect S corporation status. Self-employment tax runs 15.3%: 12.4% for Social Security (on earnings up to $184,500 in 2026) and 2.9% for Medicare (uncapped).3Internal Revenue Service. Self-Employment Tax (Social Security and Medicare Taxes)4Social Security Administration. Contribution and Benefit Base
In a standard LLC taxed as a partnership or disregarded entity, an active owner generally pays self-employment tax on all net business earnings. A single-owner LLC with $200,000 in profit pays the 15.3% on the full $200,000.
S corporation owners who work in the business take a different path. They pay themselves a salary that’s subject to normal payroll taxes. Anything left over can be taken as a shareholder distribution, and distributions are not subject to self-employment or payroll taxes.5Internal Revenue Service. S Corporation Compensation and Medical Insurance Issues Take that same $200,000 business, pay the owner a $90,000 salary, and distribute the remaining $110,000. Payroll taxes only apply to the $90,000.
The savings are real, but they’re not free. Running payroll costs money. Tax preparation gets more expensive. There’s more administrative overhead. For a business clearing $40,000 a year, the math almost never works. Somewhere north of that, depending on the industry and the owner’s role, the election starts paying for itself.
What Counts as a Reasonable Salary
The IRS knows the payroll tax game and watches it closely. Paying yourself a token salary and taking the rest as distributions invites reclassification. The agency can convert distributions to wages and assess back payroll taxes, interest, and penalties.6Internal Revenue Service. S Corporation Employees, Shareholders and Corporate Officers
Courts weigh several factors when deciding whether compensation is reasonable:
- The owner’s training, experience, and credentials
- Actual duties and day-to-day responsibilities
- Hours worked
- What comparable businesses pay for similar roles
- Whether the business has paid large distributions while keeping salaries low
- Whether written compensation agreements exist and use objective criteria
Document your salary decision every year. Pull data from industry surveys or job postings for comparable roles, and keep a written record of your reasoning. An auditor who sees a paper trail is less likely to challenge the number than one who sees a round figure with nothing behind it.7Internal Revenue Service. Wage Compensation for S Corporation Officers
Who Can Own the Business
S corporations face strict federal ownership rules. No more than 100 shareholders. Every shareholder must be a U.S. citizen, a U.S. resident, or one of a small set of qualifying trusts and estates. Other corporations, partnerships, and LLCs cannot hold shares. Nonresident aliens are excluded entirely.8Office of the Law Revision Counsel. 26 USC 1361 – S Corporation Defined
The trust rules matter for estate planning. Only two trust types can hold S corporation shares long term: a Qualified Subchapter S Trust (QSST), which must have a single lifetime beneficiary and distribute all income currently, and an Electing Small Business Trust (ESBT), which can have multiple beneficiaries but pays tax on S corporation income at the highest individual rate. A non-qualifying trust receiving shares terminates the election automatically.
LLCs have none of these restrictions. Members can include foreign individuals, corporations, other LLCs, or partnerships, and there’s no ceiling on how many.9Internal Revenue Service. Limited Liability Company (LLC) For businesses seeking foreign capital, building holding-company structures, or bringing in institutional partners, an LLC without an S election is often the only workable option.
How Profits Get Split
S corporations may have only one class of stock.8Office of the Law Revision Counsel. 26 USC 1361 – S Corporation Defined Every share carries the same rights to distributions and liquidation proceeds. A 30% shareholder gets 30% of the profits. Voting and non-voting shares are allowed, but you cannot pay one owner a larger share of profits than their ownership percentage.
LLCs are far more flexible. The operating agreement can allocate profits and losses however the members agree. A member who puts in 20% of the capital can receive 40% of the profits if the others agree that member’s expertise or labor justifies it. Special allocations like this are routine in real estate deals, professional partnerships, and startups where sweat equity matters as much as cash.
Deducting Losses: The Basis Trap
Here’s a difference that rarely gets attention until it costs someone real money. How much of the business’s losses you can deduct on your personal return depends on your tax basis in the entity, and the rules diverge sharply between LLCs and S corporations.
An S corporation shareholder can deduct losses only up to the sum of two amounts: their stock basis (roughly what they invested plus accumulated income minus distributions) and the basis of any loans they personally made to the corporation.10Office of the Law Revision Counsel. 26 USC 1366 – Pass-Thru of Items to Shareholders A bank loan to the corporation, even one the shareholder personally guarantees, does not increase debt basis. Only direct loans from shareholder to corporation count.
LLC members taxed as a partnership get a better deal. Under IRC Section 752, a member’s share of the LLC’s liabilities increases their outside basis. An LLC that borrows $500,000 from a bank allocates that debt among the members and expands their ability to deduct losses.11Internal Revenue Service. Recourse vs. Nonrecourse Liabilities For capital-intensive businesses or real estate ventures carrying significant debt, this is a large advantage. An LLC member can deduct losses from a leveraged investment that an S corporation shareholder in the same economic position cannot.
Paperwork and Formalities
An S corporation organized as a traditional corporation inherits everything that comes with corporate law. State statutes typically require a board of directors, officers, annual shareholder meetings, regular board meetings, and formal minutes for major decisions. Skipping these steps isn’t just abstract legal risk. It gives creditors an argument that the corporation is a shell for the owner’s personal finances, which can lead a court to hold the owner personally liable.
LLCs run with fewer mandatory procedures. Governance is set by the operating agreement, which the members draft themselves. Members can manage directly or appoint managers. Most states don’t require annual meetings or minutes, though keeping them is still smart. The operating agreement controls internal procedure; the state won’t impose a rigid hierarchy.
Both structures can lose liability protection if owners treat the business as a personal wallet. Courts look at commingling of funds, whether the entity was adequately capitalized, and whether basic formalities were observed. A separate bank account, documented distributions, and clean expense records matter for both. The corporate meeting requirements make some of this automatic. LLC owners have to supply the discipline themselves.
Health Insurance for S Corporation Owners
S corporations handle owner health insurance in a way that catches first-time owners off guard. A shareholder who owns more than 2% of the company cannot receive tax-free health insurance the way a regular W-2 employee can. The corporation must add premium costs to that shareholder’s W-2 wages in Box 1, making them subject to federal income tax. They’re excluded from Social Security and Medicare wages, so payroll taxes don’t apply.5Internal Revenue Service. S Corporation Compensation and Medical Insurance Issues
The shareholder then deducts those premiums on their personal return as the self-employed health insurance deduction, which reduces adjusted gross income. To qualify, the S corporation must have established the plan and properly reported the premiums on the W-2. If a spouse’s employer offers subsidized coverage, the deduction is unavailable for any month that coverage was available.
LLC members in a partnership-taxed LLC deduct premiums through guaranteed payments or as part of self-employment income, without the W-2 reporting step. The end result is often similar, but the S corporation route has more moving parts and is easier to fumble.
Electing S Corporation Status
An LLC or corporation electing S corporation taxation files IRS Form 2553.12Internal Revenue Service. Instructions for Form 2553 – Election by a Small Business Corporation The form asks for the entity’s EIN, date of incorporation or formation, the desired tax year, and the name, address, and taxpayer ID of every shareholder or member. Every owner must sign the consent. One holdout blocks the election.
The deadline is the 15th day of the third month of the tax year the election should take effect. For a calendar-year business, March 15. You can also file at any time during the preceding tax year.13Office of the Law Revision Counsel. 26 USC 1362 – Election; Revocation; Termination File after the deadline and the election typically takes effect the following tax year.
Missing the deadline is not always fatal. Under Revenue Procedure 2013-30, the IRS grants automatic late-election relief if the entity intended to be an S corporation from the start, the only defect is the late filing, the entity and shareholders reported income consistently with S status, and there’s reasonable cause for the delay.14Internal Revenue Service. Late Election Relief Relief must generally be requested within 3 years and 75 days of the intended effective date.
Ending or Losing the Election
Once elected, S corporation status can end voluntarily or involuntarily. To revoke voluntarily, shareholders holding more than half of the outstanding shares must consent. Filed on or before March 15 of a calendar-year corporation, the revocation takes effect January 1 of that year. Filed later, it takes effect January 1 of the following year, unless a future effective date is specified.13Office of the Law Revision Counsel. 26 USC 1362 – Election; Revocation; Termination
Involuntary termination happens whenever the entity stops meeting the eligibility rules. Selling shares to a nonresident alien, bringing in a corporate shareholder, exceeding 100 shareholders, or creating a second class of stock kills the election immediately. After termination, the business generally cannot re-elect S status for five tax years without IRS permission.
For an LLC that had elected S corporation taxation, losing the election doesn’t dissolve the LLC. It reverts to its default classification as a partnership or disregarded entity, and the legal entity continues under state law exactly as before. For a traditional corporation, losing S status means becoming a C corporation and facing double taxation going forward.